Device for reducing the skin and wave resistance of moving boats



Jan. 1, 1929. v 1,697,257

B. AN ISSIMOFF DEVICE FOR REDUCING THE SKIN M JD WAVE RESISTANCE 0F MOVING BOATS Filed Jan. 10., 1.928

INVENTOR Bogs Jar/armor;

, l l I ATTORNEY Patented Jan. 1,- 1929. a

UNITED STATES 1,697,257 PATENT OFFICE BORIS ANISSIMDFF, OF MANILA, PHILIPPINE ISLANDS.

DEVICE FOR REDUCING THE SKIN WAVE RESISTANCE OF'MOVIN G BOATS.

' Application med January 10, 1928. Serial No. 245,746.

My invention relatesto boats and an object thereof is to provid'e a' boat wherein skin resistance to the water 1n which the boat is moving is reduced to a minimum and thus permit the boatto attain a greater speed.

pressed fluid apparatus for discharging fluid currents over the boats surface to counteract resistance to the latter by the body of advantages in mind, the invention consists.

in the novel combination of elements, constructions and arrangement of parts to be hereinafter specifically referred to, claimed and illustrated in the 'accompanylng drawings, wherein Figure 1 is a side elevation of a boat embodying my invention parts of the latter bein illustrated in broiren lines;

Figure 2 is a bottom plan viewof the same;

Figure 3 is a frafgmentary horizontal section on line 33 Figure 1;

Figure 4: is a similar view taken on line 4-4 of Figure 2;

Figure 5 is a fragmentary perspective of one of the fluid conducting conduits or jets attached to the boat hull; and

Figure 6 is a perspective of the valve element arranged in each of the fluid conducting conduits or jets.

. rearwardly inclined parallel Referring to the invention in detail a con- -.ventional boat or water craft 5 is provided,

and mounted therein is an air compressor 6 adapted to discharge compressed air oyer the boats surface to counteract the resistance to the latter by the body of water in which the boat is travelling.

To conduct the compressed air from the l -com ressor and discharge it over the bow of the cat, a main conduit 10 extends Ion tudinally of the 'boats bottom centra y thereof and upwardly around its prow, and communicating therewith is a lurality of which are disposed upon the outer face of the hull. The conduit 10 extends ,from a point slightly below the normal low water line of the'boat to the end of the bow, while the branch conduits terminate at points below theinormal low water line.

As illustrated in Figure-4, the ferwa'rdf end of the conduit is V-sha'ped in cross- Further the invention provides a com secured to the ranches I5- .outer surface of the boats section, as indicated at 20, to conform to the cross-sectional contour of the prow, and is formed with rearwardly extended marginal flanges which are secured to the prow by rivets or other suitable fastenings 22. J

Theconduits comprise longitudinally curved plates 23 which conform to the contour of the hull, and longitudinally curved channel'shaped members 24: having marginal flanges 25 which are riveted or otherwise 7 plates, as at 26. Transverse fastenings 27 pass through the flanges, plates and hull to secure the branch conduits in place. i

It is proposed to discharge air jets over the boat hull at points of greatest resistance to the water,

perforations 28 upon opposite sides of the prow rearwardly of its apex. Similar openings 29 are provided in the rear Wall of each of the branch conduits in close proximity to the hull. I

An air supply pipe 30 leads from the air compressor and communicates with the, main conduit, intermediate its ends, to be conducted through the latter and branch conduits to play upon the outer surface of the hull, in t e form of jets.

To ermita predetermined air pressure to pass t rough each of the branch conduits,

and to that end the v-shaped part of the conduitlO is provided with rows of i according to the water pressure or water resistance, a plate valve 31 is pivotally arranged in each of the branch conduits adjacent its inner end, the latter having an upstanding pin 32 which is pivotally engaged with the outer wall of its respective branch conduit and formed the valve may beadjusted about its axis. As illustrated in Figure 6, the valve is the For the purpose of controlling the operawith a head 43 whereby" as same -configuration as the cross-sectional tion of the compressor a vertically extending pipe 34 leads from the compressor to the bridge of the boat a control valve 351., With my invention it will be observed that fluid pressure is discharged in jets over the water, im elling the latter the water to the boa bow againsttheaway from; the boat and t us reduce the u'ction or skin of and is provided with What is claimed is:

1. In combination a water craft, a main conduit extending longitudinally and exteriorly thereof, a plurality of parallel perforated branches communicating therewith, and means for supplying fluid pressure to the conduit to be discharged in jets over the crafts surface to overcome the resistance of a body of water in wh1ch the craft is travelconduit extending centrally/along its bottom and having its forward end extended v around the erafts prow, said forward end having perforations, a plurality of branch conduits'communicating with the first mentioned conduit and extending upwardly along the crafts hull and also provided with perforations, and an 'air compressor communicating with'the first mentioned; conduit.

4. In combination a water craft; a conduit extending longitudinally of its bottom and having a forward V-shap'ed in cross-section extremity embracing and attached to the prow of the craft and provided with per-.

forations, a plurality of parallel branch con duits communicating with the first menvtioned conduit and ,having perforationsin the rear walls thereof, and means forsupplying compressed fluid to the first mentioned conduit to be discharged through the perforations onto'the outer surface of the hull to react upon the water,in close proximity-tothe craft and force the water awayfromthe same.

1 Bears ANISSIIMOFF. 

